diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2023-06-06 09:51:26 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-06-06 18:31:37 +0200 |
| commit | 6c3211796326a9d35618b866826ca556c8f008a8 (patch) | |
| tree | 1c7688af3e1e4ff079a6875cc8c2cf3ba8781b51 /arch/x86/include/asm | |
| parent | 15d9088779b8693cffe47527ea4f9ff8fde4cd03 (diff) | |
x86/sev: Add SNP-specific unaccepted memory support
Add SNP-specific hooks to the unaccepted memory support in the boot
path (__accept_memory()) and the core kernel (accept_memory()) in order
to support booting SNP guests when unaccepted memory is present. Without
this support, SNP guests will fail to boot and/or panic() when unaccepted
memory is present in the EFI memory map.
The process of accepting memory under SNP involves invoking the hypervisor
to perform a page state change for the page to private memory and then
issuing a PVALIDATE instruction to accept the page.
Since the boot path and the core kernel paths perform similar operations,
move the pvalidate_pages() and vmgexit_psc() functions into sev-shared.c
to avoid code duplication.
Create the new header file arch/x86/boot/compressed/sev.h because adding
the function declaration to any of the existing SEV related header files
pulls in too many other header files, causing the build to fail.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/a52fa69f460fd1876d70074b20ad68210dfc31dd.1686063086.git.thomas.lendacky@amd.com
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/sev.h | 3 | ||||
| -rw-r--r-- | arch/x86/include/asm/unaccepted_memory.h | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index e21e1c5397c1..86e1296e87f5 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -206,6 +206,7 @@ void snp_set_wakeup_secondary_cpu(void); bool snp_init(struct boot_params *bp); void __init __noreturn snp_abort(void); int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); +void snp_accept_memory(phys_addr_t start, phys_addr_t end); #else static inline void sev_es_ist_enter(struct pt_regs *regs) { } static inline void sev_es_ist_exit(void) { } @@ -229,6 +230,8 @@ static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *in { return -ENOTTY; } + +static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } #endif #endif diff --git a/arch/x86/include/asm/unaccepted_memory.h b/arch/x86/include/asm/unaccepted_memory.h index 572514e36fde..f5937e9866ac 100644 --- a/arch/x86/include/asm/unaccepted_memory.h +++ b/arch/x86/include/asm/unaccepted_memory.h @@ -3,6 +3,7 @@ #include <linux/efi.h> #include <asm/tdx.h> +#include <asm/sev.h> static inline void arch_accept_memory(phys_addr_t start, phys_addr_t end) { @@ -10,6 +11,8 @@ static inline void arch_accept_memory(phys_addr_t start, phys_addr_t end) if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) { if (!tdx_accept_memory(start, end)) panic("TDX: Failed to accept memory\n"); + } else if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) { + snp_accept_memory(start, end); } else { panic("Cannot accept memory: unknown platform\n"); } |